﻿// Copyright © 2015, 2017 Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most 
// MySQL Connectors. There are special exceptions to the terms and 
// conditions of the GPLv2 as it is applied to this software, see the 
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify 
// it under the terms of the GNU General Public License as published 
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but 
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
// for more details.
//
// You should have received a copy of the GNU General Public License along 
// with this program; if not, write to the Free Software Foundation, Inc., 
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA

using System.Text;
using Microsoft.EntityFrameworkCore.Update;
using Microsoft.EntityFrameworkCore.Storage;

namespace MySql.Data.EntityFrameworkCore
{
  internal partial class MySQLUpdateSqlGenerator : UpdateSqlGenerator
  {
    protected override void AppendIdentityWhereCondition(StringBuilder commandStringBuilder, ColumnModification columnModification)
    {
      ThrowIf.Argument.IsNull(columnModification, "columnModification");
      ThrowIf.Argument.IsNull(commandStringBuilder, "commandStringBuilder");
      commandStringBuilder.AppendFormat("{0}=LAST_INSERT_ID()", SqlGenerationHelper.DelimitIdentifier(columnModification.ColumnName));
    }


    protected override void AppendRowsAffectedWhereCondition(StringBuilder commandStringBuilder, int expectedRowsAffected)
    {
      ThrowIf.Argument.IsNull(commandStringBuilder, "commandStringBuilder");
      commandStringBuilder
        .Append("ROW_COUNT() = " + expectedRowsAffected)
        .AppendLine();
    }

    protected override ResultSetMapping AppendSelectAffectedCountCommand(StringBuilder commandStringBuilder, string name, string schemaName, int commandPosition)
    {
      ThrowIf.Argument.IsNull(commandStringBuilder, "commandStringBuilder");
      ThrowIf.Argument.IsEmpty(name, "name");


      commandStringBuilder
        .Append("SELECT ROW_COUNT()")
        .Append(SqlGenerationHelper.StatementTerminator)
        .AppendLine();

      return ResultSetMapping.LastInResultSet;
    }

    public enum ResultsGrouping
    {
      OneResultSet,
      OneCommandPerResultSet
    }
  }
}
